Class: MixinBot::Nfo

Inherits:
Object
  • Object
show all
Defined in:
lib/mixin_bot/nfo.rb

Constant Summary collapse

NFT_MEMO_PREFIX = 
'NFO'
NFT_MEMO_VERSION = 
0x00
NFT_MEMO_DEFAULT_CHAIN = 
'43d61dcd-e413-450d-80b8-101d5e903357'
NFT_MEMO_DEFAULT_CLASS = 
'3c8c161a18ae2c8b14fda1216fff7da88c419b5d'
NULL_UUID = 
'00000000-0000-0000-0000-000000000000'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**kwargs) ⇒ Nfo

Returns a new instance of Nfo.



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# File 'lib/mixin_bot/nfo.rb', line 14

def initialize(**kwargs)
  @prefix = NFT_MEMO_PREFIX
  @version = NFT_MEMO_VERSION
  @mask = kwargs[:mask] || 0
  @chain = kwargs[:chain] || NFT_MEMO_DEFAULT_CHAIN
  @nm_class = kwargs[:nm_class] || NFT_MEMO_DEFAULT_CLASS
  @collection = kwargs[:collection] || NULL_UUID
  @token = kwargs[:token].presence&.to_i
  @extra = kwargs[:extra]
  @memo = kwargs[:memo]
  @hex = kwargs[:hex]
end

Instance Attribute Details

#chain ⇒ Object

Returns the value of attribute chain.



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# File 'lib/mixin_bot/nfo.rb', line 12

def chain
  @chain
end

#collection ⇒ Object

Returns the value of attribute collection.



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# File 'lib/mixin_bot/nfo.rb', line 12

def collection
  @collection
end

#extra ⇒ Object

Returns the value of attribute extra.



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# File 'lib/mixin_bot/nfo.rb', line 12

def extra
  @extra
end

#hex ⇒ Object

Returns the value of attribute hex.



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# File 'lib/mixin_bot/nfo.rb', line 12

def hex
  @hex
end

#mask ⇒ Object

Returns the value of attribute mask.



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# File 'lib/mixin_bot/nfo.rb', line 12

def mask
  @mask
end

#memo ⇒ Object

Returns the value of attribute memo.



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# File 'lib/mixin_bot/nfo.rb', line 12

def memo
  @memo
end

#nm_class ⇒ Object

Returns the value of attribute nm_class.



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# File 'lib/mixin_bot/nfo.rb', line 12

def nm_class
  @nm_class
end

#prefix ⇒ Object (readonly)

Returns the value of attribute prefix.



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# File 'lib/mixin_bot/nfo.rb', line 11

def prefix
  @prefix
end

#raw ⇒ Object (readonly)

Returns the value of attribute raw.



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# File 'lib/mixin_bot/nfo.rb', line 11

def raw
  @raw
end

#token ⇒ Object

Returns the value of attribute token.



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# File 'lib/mixin_bot/nfo.rb', line 12

def token
  @token
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/mixin_bot/nfo.rb', line 11

def version
  @version
end

Instance Method Details

#decode ⇒ Object 



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# File 'lib/mixin_bot/nfo.rb', line 105

def decode
  @raw =
    if memo.present?
      Base64.urlsafe_decode64 memo
    elsif hex.present?
      [hex].pack('H*')
    else
      raise InvalidNfoFormatError, 'memo or hex is required'
    end

  @hex = raw.unpack1('H*') if hex.blank?
  @memo = Base64.urlsafe_encode64 raw, padding: false if memo.blank?

  decode_bytes
  self
end

#decode_bytes ⇒ Object

Raises:



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# File 'lib/mixin_bot/nfo.rb', line 122

def decode_bytes
  bytes = raw.bytes

  _prefix = bytes.shift(3).pack('C*')
  raise MixinBot::InvalidNfoFormatError, "NFO prefix #{_prefix}" if _prefix != prefix

  _version = bytes.shift
  raise MixinBot::InvalidNfoFormatError, "NFO version #{prefix}" if _version != version

  hint = bytes.shift
  if hint == 1
    @mask = bytes.shift(8).reverse.pack('C*').unpack1('Q*')

    @chain = MixinBot::UUID.new(hex: bytes.shift(16).pack('C*').unpack1('H*')).unpacked

    class_length = bytes.shift
    @nm_class = bytes.shift(class_length).pack('C*').unpack1('H*')

    collection_length = bytes.shift
    @collection = MixinBot::UUID.new(hex: bytes.shift(collection_length).pack('C*').unpack1('H*')).unpacked

    token_length = bytes.shift
    @token = MixinBot.utils.decode_int bytes.shift(token_length)
  end

  extra_length = bytes.shift
  @extra = bytes.shift(extra_length).pack('C*').unpack1('H*')

  self
end

#encode ⇒ Object 



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# File 'lib/mixin_bot/nfo.rb', line 67

def encode
  bytes = []

  bytes += prefix.bytes
  bytes += [version]

  if mask.zero?
    bytes += [0]
  else
    bytes += [1]
    bytes += MixinBot.utils.encode_uint64 mask
    bytes += MixinBot::UUID.new(hex: chain).packed.bytes

    class_bytes = [nm_class].pack('H*').bytes
    bytes += MixinBot.utils.encode_int class_bytes.size
    bytes += class_bytes

    collection_bytes = collection.split('-').pack('H* H* H* H* H*').bytes
    bytes += MixinBot.utils.encode_int collection_bytes.size
    bytes += collection_bytes

    # token_bytes = memo[:token].split('-').pack('H* H* H* H* H*').bytes
    token_bytes = MixinBot.utils.encode_int token
    bytes += MixinBot.utils.encode_int token_bytes.size
    bytes += token_bytes
  end

  extra_bytes = [extra].pack('H*').bytes
  bytes += MixinBot.utils.encode_int extra_bytes.size
  bytes += extra_bytes

  @raw = bytes.pack('C*')
  @hex = raw.unpack1('H*')
  @memo = Base64.urlsafe_encode64 raw, padding: false

  self
end

#mark(*indexes) ⇒ Object 



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# File 'lib/mixin_bot/nfo.rb', line 59

def mark(*indexes)
  indexes.map do |index|
    raise ArgumentError, "invalid NFO memo index #{index}" if index >= 64 || index.negative?

    @mask = mask ^ (1 << index)
  end
end

#mint_memo ⇒ Object

Raises:



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# File 'lib/mixin_bot/nfo.rb', line 27

def mint_memo
  raise MixinBot::InvalidNfoFormatError, 'token is required' if token.blank?
  raise MixinBot::InvalidNfoFormatError, 'extra must be 256-bit string' if extra.blank? || extra.size != 64

  @collection = NULL_UUID if collection.blank?
  @chain = NFT_MEMO_DEFAULT_CHAIN
  @nm_class = NFT_MEMO_DEFAULT_CLASS
  mark 0
  encode

  memo
end

#to_h ⇒ Object 



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# File 'lib/mixin_bot/nfo.rb', line 153

def to_h
  hash = {
    prefix:,
    version:,
    mask:,
    chain:,
    class: nm_class,
    collection:,
    token:,
    extra:,
    memo:,
    hex:
  }

  hash.each do |key, value|
    hash.delete key if value.blank?
  end

  hash
end

#unique_token_id ⇒ Object 



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# File 'lib/mixin_bot/nfo.rb', line 40

def unique_token_id
  bytes = []
  bytes += MixinBot::UUID.new(hex: chain).packed.bytes
  bytes += [nm_class].pack('H*').bytes
  bytes += MixinBot::UUID.new(hex: collection).packed.bytes
  bytes += MixinBot.utils.encode_int token

  md5 = Digest::MD5.new
  md5.update bytes.pack('c*')
  digest = [md5.hexdigest].pack('H*').bytes

  digest[6] = (digest[6] & 0x0f) | 0x30
  digest[8] = (digest[8] & 0x3f) | 0x80

  hex = digest.pack('c*').unpack1('H*')

  MixinBot::UUID.new(hex:).unpacked
end